Topological slow-light in one-dimensional conjugated photonic systems.

Topological slow-light in a one-dimensional conjugated topological photonic crystal (CTPhC) is presented. The study shows that extremely slow-light of 26.57 m/s group velocity and 7.52 × 10−7 s group delay are achieved in the proposed CTPhC with 20 μm thick, which is better than traditional approaches of slow-light. Results also show that there are two significant sensitive parameters for slow-light in the CTPhC. Robust and ultra-slow-light is achieved as the refractive index contrast of materials and the number of layers increases. It is worth noting that the CTPhC has a symmetric and wide operating range photonic bandgap, which has better slow-light effects than typical topological photonic crystal. It is expected that the CTPhC can provide an efficient approach to constructing robust and ultra-slow-light devices. • Topological slow-light in a one-dimensional conjugated topological photonic crystal is presented. • The conjugated topological photonic crystal has a symmetric and wide operating range photonic bandgap. • An extraordinary slow-light of 26.57 m/s group velocity and 7.52 × 10-7 s group delay are achieved. [ABSTRACT FROM AUTHOR]